Trail de la Montagne is a small autumn trail event held at the Salle Polyvalente in Fleury-la-Vallée, Yonne. It features three running distances: 10 km with 150 m elevation gain, 20 km with 300 m, and 30 km with 450 m. The participant limit is 300 runners, and the previous edition reached this number, creating a local, compact atmosphere. The event also offers two walks for hikers and Nordic walkers, allowing leashed dogs, and includes 1 km and 3 km races for children aged 6 to 15.
The 10 km course runs through the lower areas near Fleury, with over 60% on singletrack. The 20 km runners begin with the 10 km field, return near the Salle Polyvalente for a refreshment stop, and then proceed toward Guerchy. The 30 km route utilizes the most challenging trails around the Montagne de Fleury, incorporating the difficult “casse pate” section towards Guerchy before ascending the hill from multiple directions. This series is celebrating its tenth edition and donates all proceeds to Association Le Chemin d’Axel, directed by Julien Nicaise.